Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.57: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Raman spectroscopy of the multiferroic manganite Eu(1-x)Y(x)MnO3 — •Sven Issing1, Andrei Pimenov2, Alexander A. Mukhin3, and Jean Geurts1 — 1Universität Würzburg, Physikalisches Institut, Experimentelle Physik III, Am Hubland, 97074 Würzburg — 2Universität Würzburg, Physikalisches Institut, Experimentelle Physik IV, Am Hubland, 97074 Würzburg — 3General Physics Institute of the Russian Acad. of Sciences, 119991 Moscow, Russia
Quite recently the existence of a strong magnetoelectric coupling in Eu(1-x)Y(x)MnO3 has been shown [1]. As follows already from the first principles, this coupling would lead to appearance of elementary excitations of magnetoelectric origin - the so called electromagnons [2].
Investigations of the Raman active phonons can provide important information on the coupling of the electromagnons to the phonons. This motivated us to carry out systematic measurements of the polarized Raman spectra in Eu(1-x)Y(x)MnO3 for several Y contents x ≤ 0.5. Our results show a good agreement with Raman spectra of other orthorhombic rare earth manganites [3]. Tuning of the A-site cation radius by increasing the Y content leads to a shift of the phonon frequencies, which can be explained by an increasing distortion from the ideal cubic perovskite structure.
[1] J. Hemberger et al., PRB 75, 035118 (2007)
[2] A. Pimenov et al., PRB 77, 014438 (2008)
[3] M. N. Iliev et al., PRB 73, 064302 (2006)